The oxidized bitumen used must also possess characteristics in the molten phase which will allow easy preparation and processing, i.e. a suitable viscosity at application temperatures with maximum thermal stability and minimum dimensional instability when applied to the manufactured product.

It has been proposed in GB-A-2 219 802 A (Vulcanite Ltd.) to incorporate a low density polyethylene into oxidized bitumen for roofing and carpet tile backing purposes.

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